{"id":"CVE-2020-17144","published":"2020-12-10T00:15:16Z","modified":"2026-06-17T02:58:45Z","title":"Microsoft Exchange Server Remote Code Execution Vulnerability","vendor":"Microsoft","product":"Exchange Server","tier":"core","eol":null,"description":{"text":"Microsoft Exchange Remote Code Execution Vulnerability","provenance":"source","from":"NVD"},"summary":{"text":"Microsoft Exchange Server contains a remote code execution flaw caused by deserialization of untrusted data. An attacker who can reach the server over the network, holds high-privilege credentials, and can get a user to interact with a crafted request or content can execute code on the affected system.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:11:16Z"},"cvss":{"score":8.4,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.36514,"percentile":0.98489,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2020-17144","provenance":"source"},"vulncheckKev":{"dateAdded":"2021-11-03","exploitedFirstSeen":"2021-11-03","ransomware":false,"evidence":[{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2021-11-03"},{"url":"https://cisa.gov/news-events/cybersecurity-advisories/aa22-047a","date":"2022-02-16"},{"url":"https://www.cert.ssi.gouv.fr/uploads/CERTFR-2023-CTI-009.pdf","date":"2023-10-26"}],"evidenceTotal":3,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17144","tags":["Patch","Vendor Advisory"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17144","tags":["Patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-17144","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Exchange is public-facing; RCE implies remote exploitation","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"Microsoft Exchange Remote Code Execution Vulnerability","start":0,"end":54}],"model":"claude-haiku-5-5","confidence":"low","confidenceNote":"needs user interaction; not a public-facing exploit"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: RCE grants command or code execution on server","mappingType":"primary_impact","evidence":[{"from":"description","quote":"Microsoft Exchange Remote Code Execution Vulnerability","start":0,"end":54}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[{"id":"SRC-48d0adadaab80eaf07f5","title":"U/OO/158036-21","publisher":"media.defense.gov","url":"https://media.defense.gov/2021/Jul/01/2002753896/-1/-1/1/CSA_GRU_GLOBAL_BRUTE_FORCE_CAMPAIGN_UOO158036-21.PDF","date":null,"mentions":[{"quote":"servers using CVE 2020-0688 and CVE 2020-17144, for remote code execution and","start":1571,"end":1648},{"quote":"2020-0688 and CVE 2020-17144 to gain privileged","start":4597,"end":4644}]}],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2020-9098","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-9098","exploited":true,"exploitedSince":"2021-11-03","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":2,"skipped":0,"earliest":"2020-12-09","earliestUrl":"https://github.com/Airboi/CVE-2020-17144-EXP","repos":[{"name":"zcgonvh/CVE-2020-17144","url":"https://github.com/zcgonvh/CVE-2020-17144","stars":158,"created":"2020-12-09"},{"name":"Airboi/CVE-2020-17144-EXP","url":"https://github.com/Airboi/CVE-2020-17144-EXP","stars":157,"created":"2020-12-09"}]},"first":{"date":"2020-12-09","source":"PoC-in-GitHub","url":"https://github.com/Airboi/CVE-2020-17144-EXP"},"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"primary","techniques":["T1059"],"provenance":"ai"},{"stage":"related","techniques":["T1190"],"provenance":"ai","lowConfidence":true}],"timeline":[{"date":"2020-12-09","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/Airboi/CVE-2020-17144-EXP","provenance":"source"},{"date":"2020-12-10","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-17144","provenance":"source"},{"date":"2021-11-03","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","provenance":"source"},{"date":"2021-11-03","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2021-11-03","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-9098","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":"PoC-in-GitHub","daysToKev":328},"priority":{"score":72.4,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 1821 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.7,"detail":"percentile 0.9849"},{"name":"Named in threat reports","points":3.87,"detail":"1 report"},{"name":"Public exploit code","points":5.0,"detail":"2 PoC-in-GitHub repos"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":5.88,"detail":"base score 8.4"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-microsoft-exchange-server-cwe-502"}}